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Memory Initialization
Section 6-4
Select “Display History”.
Select “Yes”.
The display history record data is initialized.
During initialization, the message “Initializing”
is displayed.
S If “No” is selected, the NT31/NT31C returns to the “MEMORY INIT. MENU”
screen without initializing the display history record data.
On completion of display history record data initialization, the message “Finished”
is displayed and the NT31/NT31C returns to the “MEMORY INIT. MENU” screen.
6-4-3 Initializing Alarm History Record Data
The alarm history record function continually checks the status of host bits that
have been designated in advance with a bit memory table, and records the time
when any of the bits is set to 1 (comes “ON”), and the number of times that each bit
comes ON.
The maximum number of records is 256 for “sort by occurrence” (order of error
occurrence) and 255 for “sort by frequency” (order of the number of times each
error has occurred).
Use the alarm history record initialization function to reset the alarm history record
data to 0, for example when the screen data has been changed, etc. Also, if
“Screen (Use Ring Buffer)” under “History Setting” in the “PT Environment Set-
tings” – “System Settings” has not been checked, no more records will be stored
after the maximum number of records has been kept, and therefore the records
must be periodically initialized. If “Screen (Use Ring Buffer)” is checked, when the
maximum number of records is reached the oldest record is deleted and the new-
est data is recorded.
Reference: The NT31/NT31C also allows the alarm history record data to be initialized by con-
trolling the PT status control area from the host. For details, refer to “Alarm history
initialization (bit 1)” (page 275).
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